Not sure if anyone knows about this or not but sometime in 1995 Benz changed the brake master cylinder on the W140 cars. Those before vin 212244 used the earlier MC that was also used on some W126 cars also, but from vin 212245 a different MC was used, on all models.

To date I haven't found an explanation but would be interested in knowing what the change was, visually there isn't any difference that I can see, at least for the S320 / S350D cars.

Any help would be appreciated

Steve A

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Steve A
92 W140 OM603
97 VW Jetta TDI
90 Passat variant TDI 6 speed MT
94 Chevy K1500 6.5TD
05 E320 CDI
+ others